+
+dnl this is used by the macro blow to general a proper config.h.in entry
+m4_define([LYX_AH_CHECK_DECL],
+[AH_TEMPLATE(AS_TR_CPP(HAVE_DECL_$1),
+ [Define if you have the prototype for function `$1'])])
+
+dnl Check things are declared in headers to avoid errors or warnings.
+dnl Called like LYX_CHECK_DECL(function, header1 header2...)
+dnl Defines HAVE_DECL_{FUNCTION}
+AC_DEFUN([LYX_CHECK_DECL],
+[LYX_AH_CHECK_DECL($1)
+for ac_header in $2
+do
+ AC_MSG_CHECKING([if $1 is declared by header $ac_header])
+ AC_EGREP_HEADER($1, $ac_header,
+ [AC_MSG_RESULT(yes)
+ AC_DEFINE_UNQUOTED(AS_TR_CPP(HAVE_DECL_$1))
+ break],
+ [AC_MSG_RESULT(no)])
+done])